Copper losses for changing load in a transformer

Q.  When a transformer is supplied by full load at 0.8 p.f. lagging its copper losses is given by Pcu. if it is supplied by half load then copper losses will be
- Published on 29 Oct 15

a. Pcu
b. 2Pcu
c. Pcu / 2
d. Pcu / 4

ANSWER: Pcu / 4

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    Discussion

  • Amrit Parajuli   -Posted on 23 Jul 21
    For Full-load, Transformer Loading = 100 %, X =1
    For Half-load, Transformer Loading = 50 %, X =1/2
    we have,
    Full load copper loss = Pcu
    Copper loss = X^2 * Full load copper loss(Pcu) = (1/2)^2 * Pcu = Pcu/4

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